JP2000164044A - Metal-covered cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lay a metal-covered cable simply and easily and execute the works with a high reliability and high efficiency. SOLUTION: A metal-covered cable 1 is composed of a conductor wire 3 to feed electricity, a sheath 5 formed from an insulating material and put on the outside of the conductor 3, and a metal covering 7 provided spirally on the outside of the sheath 5, wherein the metal covering 7 is shaped undulately in the longitudinal direction of the conductor 3 in such a way that the width of each crest of undulation is greater than the width of the bottom 12, and a space 20 is formed between the sheath 5 and covering 7. The apex of the crest 8 of metal covering is shaped flat, and undulation is made rectangular.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal-coated cable for transmitting electricity.

[0002]

2. Description of the Related Art Conventionally, when laying a cable for transmitting electricity, a metal-coated cable is used in which a protective metal coating is provided on the cable without using a cable tray or a conduit to protect the cable. That is being done.

FIG. 6 shows a metal-coated cable according to the prior art, where (A) is a perspective view, (B) is a cross-sectional view, and (C) is a view of (A).
It is an I section enlarged sectional view. Conventional metal-coated cable 40
Is provided with a cable sheath 44 formed of an insulating material outside a plurality of conductors 42, and a metal coating 46 is spirally wound in contact with the outside of the cable sheath 44. Anti-corrosion coating 4 outside 46
8 is given. The metal coating 46 has the same waveform in both peaks and valleys as shown in FIG.

FIGS. 7A and 7B show a metal-coated cable according to the prior art, wherein FIG. 7A is a front view, FIG.
(C) is an explanatory diagram of a terminal process. At the time of construction, the anticorrosion coating 48 at the end of the metal-coated cable 40 is peeled off by a necessary length with a knife or a cutter (FIGS. 7A and 7B).
Next, the end of the metal coating 46 is cut at a position a with gold scissors or the like, and the cut portion is raised (FIG. 7C,
(D)) and inserted into the groove provided at the tip of the tool 50 (FIG. 7).
(E)), while rotating the tool 50 (FIG. 5)
(F)), the metal coating 46 is peeled off along the metal coating cable 40.

[0005]

However, when the above-described conventional metal-coated cable 40 is laid, it is necessary to peel off the metal coating 46 when connecting the core wire (conductor) 42 to a terminal block or the like. At this time, great care must be taken not to damage the internal cable sheath 44, so that a great deal of time and effort is required for the process.

[0006] This large amount of time and labor requires a large number of man-hours, which is a reason why the use of the metal-coated cable 40 is avoided, and a cable structure requiring no man-hour has been desired.

Further, a metal-coated cable 4 is used as the cable.
If 0 is not used, for example, a conduit will be installed and a cable will be passed through it. If the cable is long, a pull box etc. will be installed in the middle or bent part where the conduit is laid. Was required, and a lot of construction work was required to lay cables.

An object of the present invention is to lay a metal-coated cable simply and easily, and to efficiently perform a highly reliable construction.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a linear conductor for transmitting electricity, a cable sheath provided outside the conductor and formed of an insulating material, A metal coating provided spirally on the metal coating, wherein the metal coating is provided in a waveform in the longitudinal direction of the conductor, and the width of the peak of the waveform is formed larger than the width of the valley. A space is provided between the cable sheath and the metal coating.

The metal coating spirally provided on the outside of the cable sheath is provided in a waveform in the longitudinal direction of the conductor, and the width of the peak of the waveform is formed larger than the width of the valley. When a cut is made in order to process the end of the cable, a wide range of the cable can be cut at the peak, so that the work can be easily performed.
Since there is sufficient space between the inner surface of the mountain portion and the surface of the cable sheath, the cable sheath is not damaged when the cut is made. Further, since a space is provided between the cable sheath and the metal coating, the cable sheath is not damaged like the mountain portion.

Further, the top of the mountain portion of the metal coating is
That is, it is formed flat. Since the top of the peak portion of the metal coating is formed flat, it is easy to attach a device or tool for making a cut, and a stable operation can be performed.

The waveform is formed in a rectangular shape. When the corrugation is formed in a rectangular shape, the attachment of a device or a tool for making a cut is more reliably stabilized, work becomes easier, and the surface of the metal-coated cable becomes cylindrical, which facilitates construction.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the metal-coated cable of the present invention will be described with reference to the drawings. In FIGS. 1 to 5, the same structures and working parts are denoted by the same reference numerals.

FIG. 1 shows an embodiment of a metal-coated cable according to the present invention, in which (A) is a perspective view and (B) is a sectional view. The metal-coated cable 1 includes a linear conductor 3 for transmitting electricity.
A cable sheath 5 provided outside the conductor 3 and formed of an insulating material; a metal coating 7 provided spirally outside the cable sheath 5; and a corrosion protection provided outside the metal coating 7. And a vinyl sheath 14. The metal coating 7 is provided in a waveform in the longitudinal direction 22 of the conductor 3,
A space 20 is provided between the cable sheath 5 and the metal coating 7. In addition, the metal-coated cable 1 of this embodiment
Has three conductors. Reference numeral 26 denotes a cable drum. The metal-coated cable 1 of the present embodiment does not require the use of a cable tray or a conduit to protect the cable, particularly when the cable is laid.

FIG. 2 is a longitudinal sectional view of the metal-coated cable of FIG. 1 in a bent state. Metal-coated cable outer diameter 26 mm,
When a metal-coated cable having a metal-coated outer diameter of 20 mm and a cable-sheath outer diameter of 10 mm is bent, it bends along the neutral axis 16, and the radius is 104 mm, which is four times the metal-coated cable outer diameter of 26 mm. In this case, the outer radius of the metal-coated cable is 117 mm, and the inner radius is 91 mm.

FIG. 3 shows a waveform of the metal-coated cable of FIG. 2 in a bent state, wherein FIG.
(B) is a waveform sectional view on the neutral axis, and (C) is an inner waveform sectional view. The outer waveform of (A) has a pitch P ₁ = 9 m.
m, width Q ₁ of peaks = 6 mm, width R _{1 of} valleys = 3 m
m, the waveform on the neutral axis (B) has a pitch P ₂ = 8 mm,
The width Q ₂ of the peak portion is 5.5 mm, and the width R ₂ of the valley portion is 2.
5 mm, the waveform inside (C) has a pitch P ₃ = 7 mm,
The width Q ₃ of the peak portion is 5 mm, and the width R ₃ of the valley portion is 2 mm. As shown in these figures, the width Q ₁ to Q portion 8 of the mountain of the waveform ₃ is larger than the width R ₁ to R ₃ of the portion 12 of the trough, respectively, the waveform is a substantially rectangular.

The outer and inner coating metal pitches P are 9 mm and 7 mm, respectively, with respect to 8 mm on the neutral axis.
In a metal-coated cable manufactured with a peak portion of 5.5 mm and a valley portion of 2.5 mm, the gap of the valley portion is 1.5 mm.
Becomes a value close to the limit. The top of the peak of Q ₂ = 5.5 mm is flattened (or flat, horizontal) by 3 mm (38% in proportion). Outer mountain part ((A)
), The flat portion is 33% in proportion to the 6 mm peak portion, and the flat portion is in proportion to the 5 mm peak portion in the inner peak portion ((C)). 42%. This bends the metal to a thickness of 0.
This is because processing was performed at about three times as large as 3 mm, and this value is obtained in consideration of ease of production. Theoretically, a perfect rectangular metal covering of 7 mm peaks and 1 mm valleys would be 104 mm
When bent with a radius, the inner valley portion has no gap and the metal peak portion comes into contact with the metal peak portion. However, if a curved portion in manufacturing is provided, the shape becomes as shown in FIG.

The metal-coated cable 1 according to the present embodiment having the above-described structure operates as follows. That is, in FIG. 1, the metal coating 7 spirally provided outside the cable sheath 5 is provided in a waveform in the longitudinal direction of the conductor 3.
Since the width Q of the peak portion of the corrugation is formed larger than the width R of the valley portion, when cutting and cutting the end portion of the metal-coated cable 1, the width of the metal-coated cable 1 is large. The range can be cut at the mountain portion 8, and the work can be performed easily. Here, with respect to the helical pitch P of the waveform of the metal coating 7, the width S of the flat portion of the peak is set to 33% or more in length, and the width R of the valley portion is reduced to 33% or less. Outside, the width S of the flat portion of the peak is set to 33% of the length of the spiral pitch P of the waveform, and the width R of the valley portion is reduced to 33%.

Since there is sufficient space 20 between the inner surface of the ridge portion 8 and the surface of the cable sheath 5, the cable sheath 5 is not damaged when the cut is made. Further, a space 20 is provided between the cable sheath 5 and the metal coating 7, particularly between the lower surface of the valley portion 12 and the surface of the cable sheath 5. I can't attach it.

Further, since the top of the peak portion 8 of the metal coating is formed flat, the mounting of the device or tool for making the cut is stable and the work is easy.

When the waveform is formed in a rectangular shape, the attachment of a device or a tool for making a cut is more stable, work becomes easier, and the flexibility of the metal-coated cable 1 for bending is increased. Easy to do.

FIGS. 4A and 4B show the terminal processing of the metal-coated cable according to the present embodiment, wherein FIG. 4A is a perspective view during cutting, and FIG. 4B is a front view after the terminal processing. When the metal-coated cable 1 is laid, the metal-coated cable 1 is laid while being unwound from the cable drum 26 (FIG. 1), and cut at a necessary place. As shown in FIG. 4 (A), a rotating blade 25 of a copper tube cutter 24, for example, is rotated as a hand-held tool by rotating a handle knob 24c in the direction of arrow 24a into a place where the metal-coated cable 1 needs to be cut. Let At this time, FIG.
The metal coating is stopped when the rotary blade 25 has penetrated the metal sheath in a range that does not contact the cable sheath 5 shown in (B). Then, the entire circumference of the vinyl sheath 14 and the metal coating 7 is cut by rotating the copper tube cutter 24 in the direction of the arrow 24a.

Next, the outer peripheral edge of the rotary blade 25 is located in the space between the metal coating and the cable sheath 5 from the outer surface of the position where the outer coat of the metal coating is to be peeled off in a direction perpendicular to the metal-coated cable 1. In this state, only the metal coating is cut to remove the metal coating and the vinyl sheath.

FIG. 5 is a perspective view showing a specific form of the terminal of the metal-coated cable of the present embodiment. When the metal coating 7 comes off, a conventional cable protected by the cable sheath 5 comes out. Therefore, the cable sheath 5 is peeled off with a cutter or the like, a bare wire (conductor) is stripped, and a crimp terminal 30 is attached to the terminal block. Connecting. The space between the cut portion of the metal coating 7 and the terminal box 32 is fixed by a connection fitting 28 which is fastened to the outside of the metal coating 7 and the vinyl sheath 14.

According to the above-mentioned metal-coated cable 1, the conventional conduit is unnecessary, and the cable laying becomes extremely easy. In the metal-coated cable 1 according to the present invention, even in a cable in which the distance between the cable sheath 5 and the metal coating 7 is small, the width of the peak of the corrugated spiral of the metal coating 7 is wide and the width of the valley is narrow. If you make it into a shape,
Since the range that can be cut at the peak of the metal coating 7 by the copper pipe cutter 24 is large, a method of bending the metal coating 7 and separating it with nippers or pliers can be used for a part of the valley, so that the degree of freedom of construction increases.

As described above, in the metal-coated cable 1 of the present embodiment, the shape of the metal coating 7 is formed into a wavy spiral shape close to a rectangle, and the ridge portion 8 is widened and the valley portion 12 is narrowed. The finished outer surface of the cable is finished flat in a cylindrical shape. When laying the metal-coated cable 1, the work of removing the metal coating can be performed with a general tool. When the copper tube cutter 24 is rotated by making a cut at the peak portion 8 of the metal coating 7, a wide range can be cut as shown in FIG. 1, so that the work can be performed easily. Cable sheath 5
It can be easily laid without damaging the surface, so that the skill of the work is not limited. Since no conduit is used, economical cable laying is possible.

[0027]

According to the metal-coated cable of the present invention, the installation is simple and easy, and the highly reliable construction can be efficiently performed.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a metal-coated cable according to the present invention, wherein (A) is a perspective view and (B) is a cross-sectional view.

FIG. 2 is a longitudinal sectional view of the metal-coated cable of FIG. 1 in a bent state.

3A and 3B show waveforms of the metal-coated cable of FIG. 2 in a bent state, wherein FIG. 3A is a waveform sectional view on an outer side, FIG. 3B is a waveform sectional view on a neutral axis, and FIG. is there.

4A and 4B show terminal processing of the metal-coated cable of the present embodiment, wherein FIG. 4A is a perspective view during cutting, and FIG. 4B is a front view after terminal processing.

FIG. 5 is a perspective view showing a specific form of a terminal of the metal-coated cable of the present embodiment.

FIG. 6 shows a metal-coated cable according to the prior art, and (A)
1 is a perspective view, (B) is a cross-sectional view, and (C) is an enlarged cross-sectional view of a part I of (A).

FIG. 7 shows a metal-coated cable according to the prior art;
(A) is a front view, (B) is an explanatory diagram of a cut, and (C) is an explanatory diagram of terminal processing.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 metal-coated cable 3 conductor 5 cable sheath 7 metal coating 8 peak 12 trough 20 space P, P _{1 to} P ₃ Spiral pitch of waveform Q, Q _{1 to} Q ₃ width of peak R, R ₁ to R ₃ valley width S, S _{1 to} S ₃ flat part width

Claims (3)

[Claims] 1. A metal-coated cable comprising: a linear conductor for transmitting electricity; a cable sheath provided outside the conductor and formed of an insulating material; and a metal coating spirally provided outside the cable sheath. In the above, the metal coating is provided in a waveform in the longitudinal direction of the conductor, and the width of a peak portion of the waveform is formed larger than the width of a valley portion, and a space is provided between the cable sheath and the metal coating. Metal-coated cable provided. 2. The metal-coated cable according to claim 1, wherein the top of the metal-covered mountain portion is formed flat. 3. The metal-coated cable according to claim 1, wherein the waveform is formed in a rectangular shape.